Wow your videos are GEM. No one has explained MSA so practically

Thanks, Paul, your case study confirms one of the biggest misunderstandings & confusions in MSA, because many people only know about GRR%, which is here "P.Total". The P.Total highly depends on the sample selection (=part-to-part variation) and therefore it is NOT an objective KPI for Meas.system assessment. AIAG even recommends option 4) of calculating GRR%, saying the Tolerance should be used, which gives you the KPI "P.Tolerance". I also like to use the formulas behind in trainings, because it makes it easier to demonstrate & follow: GRR(Total) = P.Total = sigma(MS) / sigma(Total), where sigma(Total) = SQRT( sigma(MS)² + sigma(Part-to-Part)²) GRR(TOL) = P.Tolerance = 6 * sigma(MS) / Tolerance From there you can see that P.Tolerance is independent from part-to-part variation, so indenpendent of sample selection, so a much more objective figure for MSA judgement. And as you mention, bad Process Cp means a big part-to-part variation, big sigma Total, which makes P.Total low and therefore look good. (P.Tolerance and P.Total are similar, if Process Cp is about 1.0, a 3-sigma process.) Or as other consequence: if you have a good process e.g. Cp=2, then you get a bad P.Total, so you would punish your Measuring Process.

I really tried to focus on your story, but I was more impressed with your handwriting and drawing skills!

Hi Paul, first I have to say that I'm happily surprised with your fast response!! I really appreciate it. Now my question is mostly about which type of MSA should I perform, due to such small quantity, however they do are expensive devices that we most make sure are their measurements are accurate.

Thanks a lot. You are the best

Thanks Paul for the video to clear up my question. As suggested I have repeated the MSA on the same part but different roll of fabric and pretty much got the same results. The values you see are %, and the test was based on moisture reading of the fabric before a wash treatment.

Hi Paul, thank you so much for your very informative videos. Could you please advice what type of MSA would you recommend to perform in a service shop where you can only find 2 pieces of the device to be measured on any given day? and no more than 50 devices are serviced per year, do we really need to perform MSA?

Hi Paul, with automation in production line, the operator may even not have any physical contact (to parts, to equipment, ...) to the entire measurement activity. Can I remove the factor "operator"? And with that, I probably can only use Anova-method to calculate GRR%, because AIAG template/formula won't work anymore. You advice?

If you were doing MSA for SPC process control then this would be an issue as you would be adjusting your process based on flawed data and therefore introducing more product variation.

In a Gage R&R do they ever measure 3 different parts (Totally different sizes, say a tray with 163 meds, a tray with 108 meds, and 1 tray with 0 meds) or in Gage R&R's do they only measure 3 versions of the same part (3 different trays, each tray with 163 meds)

Hi Paul. What are your thoughts about the main difference between MSA TYPE 1 study and MSA TYPE 3 study? if you are measuring a Diameter of a product with a non contact measuring device, would either be ok to use? any advice would be appreciated

Thanks, Pauls for the Video. SO could you give me a file excel to practice?